Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
This item does not fit your vehicle
2012 Mini Countryman
These items fit your vehicle
2012 Mini Countryman
To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
This harness plugs right into the vehicle’s factory connectors behind the trim panels. There’s no cutting or splicing wires—each plug matches up one way, so it’s simple to get right. The fit is tight and clean, keeping the install hidden and protected.
The built-in powered converter takes its 12-volt feed from the vehicle’s battery instead of pulling current from the lighting circuits. That keeps the vehicle wiring safe from overloads. One fuse protects the converter, and a second 10-amp low-profile fuse in the interior panel protects the factory circuit.
The 4-flat connector gives you all the lighting functions—running lights, turn signals, and brake lights—and it’s fully compatible with LED trailer lamps. The powered design helps ensure proper function even with low-draw LEDs.
Unlike some kits that need a long power lead to the engine bay, this harness taps into an existing 12-volt supply in the rear of the vehicle. That means fewer steps and no routing a wire all the way forward, saving time while still giving you reliable power.
The module outputs up to 3 amps for stop and turn signals and up to 6 amps for tail lights. That’s plenty for small and mid-size trailers, with circuit protection built in to prevent shorts or overloads.
This harness includes two fuses — one inline fuse that protects the converter and one 10-amp mini fuse that installs in the vehicle’s interior fuse panel to protect the vehicle’s wiring. The powered converter reduces strain on the vehicle’s lighting system by drawing power directly from the battery. The harness is a plug-and-play design requiring no wire splicing.
Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
Ratings & Reviews
Howie P.
4/26/2017
Still working great! No problems with the wiring at all!
Robert
2/16/2026
Failed within a year and had to be replaced.
Carolyn
12/17/2020
Great! We use the hitch for an electric wheelchair for my 90 year old dad. I’m the one that has to hookup it all on my own. Couldn’t be more pleased with the fit. Thanks for being a great company via the internet. Carolyn a loyal customer
Mike L.
10/14/2026
You're very welcome, Sir! I'm glad the taillight harness/converter is working well for you!
Keith
5/13/2025
It has been working perfectly. I have had no problems at all. In fact, I forgot all about this. Ha!
Kate F.
5/19/2025
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
James D.
6/12/2026
Thank you for letting us know Daniel, Since the running lights were working, it indicates that the harness was receiving power. In situations where the running lights work but the brake lights and turn signals do not, the cause is often related to a connection, grounding, fuse, or installation issue rather than the running light circuit itself. A few things to check would be: Verify that all vehicle side connectors are fully seated and securely connected. Confirm that the ground wire is attached to a clean, bare metal surface. Check the inline fuse and any related vehicle fuses to ensure they have not blown. Test the 4-way connector directly to verify that the brake and turn signal circuits are receiving power. Let me know how that goes and we appreciate your feedback!